[PATCH] Add support for annotated minimum dependence distance

[Arch D. Robison]

This patch enables producers of LLVM IR to tell the LoopVectorizer (and other tools) that there is a minimum dependence distance, such as with the OpenMP 4.0 "safelen" clause.  See email chain http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-August/075701.html for discussion.  The updates to LangRef explain the final design.

http://reviews.llvm.org/D5123

Files:
  docs/LangRef.rst
  include/llvm/Analysis/LoopInfo.h
  lib/Analysis/LoopInfo.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/X86/min-dep-dist.ll
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